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The Creatures technically don't have a personality due to the lack of a soul, or brain perhaps. However, they are controlled to kill and collect souls. This means that they are perfectly fine with killing people with no remorse. They are attracted to human souls which allows them to hunt down other humans.

Kumuzilla was first mentioned by Zachary, in his warning towards Undyne and Ronan. It caused the ground to tremble, and it emerged soon after. It began attacking Gaster and Jessica. Kumuzilla was shot by three Perseverance Officers and it caused minor damage, but it was counter-productive and created components of the creature, which then killed the three officers. It also sent three of its components to steal Ronan's Soul, two components were shot by Ronan and the other one sneaking up on him was destroyed by Hugo. However, the Kumuzilla came up behind Hugo, to which Ronan pushed him out of the way, and took numerous potentially fatal hits from it. It also attempted to kill Gaster and broke a building, trapping Jessica and Gaster into rubble.

Its shadow is seen later towering over Undyne, Hugo, and an unconscious Ronan as Undyne prepares to fight it.